A ship, or pairing, of the two fictional characters Charles Xavior and Erik Lehnsherr from the X-Men franchise. The most popular version of this ship on the X-Men time line is during X-Men: First Class, during which time the characters are portrayed by actors
James McAvoy and
Michael Fassbender. It is
one of the most popular ships in the X-Men fandom and causes 95% of fans to experience "feels". If you don't ship it, you obviously don't have a soul or working eyes.